Firstly, I assume you are not getting any fault codes on the engine trouble light? Secondly, I take it you are referring to the 10A 'injection' fuse #5? (Fuse numbers are read from left to right.) I take it the ignition works and the dash/idiot lights come on? Is the pump priming with the ignition on? Have you got a spark?

The most likely cause of your problem is the wiring to the fuel injector under the tank. It has an annoying habit of rubbing through on the top left frame rail on earlier Z models (later ones had a rubber pad fitted to the frame). The symptoms are pretty much as you describe and initially are worse in wet weather as the moisture 'helps' any short get to ground. This problem does not always flag up an error code either; it just causes intermittent or no running and blown fuses. (The HT and LT connections on the coil also suffer from water ingress and cause intermittent running and/or a non-starter in the wet, but neither would cause fuse 5 to blow.)

Here's a photo which shows the problem area with the injector wiring/loom and the pad I have fitted to mine to keep the loom off the frame.



Start with this. Whip the tank off and check this area and, while you�re at it, any other iffy looking connectors or abraded wires.

And, yes - You cannot access diagnostics through the dash on a Z. You need a plug in FI diagnostic tool like this:



Which plugs in here:

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